Siffleur Wilderness Area, Protected wilderness area in Clearwater County, Canada

The Siffleur Wilderness Area lies near the west end and south side of Canadian Highway 11, just south of the White Goat Wilderness Area, near the north end of Banff National Park and the south end of Jasper National Park. Mountains rise to 3,300 metres, with glacier-carved valleys, mountain lakes and alpine meadows. Above the 2,100-metre tree line grow grasses, sedges and wildflowers; below are subalpine spruce, fir and lodgepole pine forests, and lower still aspen and balsam poplar.

The Siffleur Wilderness Area was established in 1961, one of Alberta's three provincially designated wilderness areas, alongside White Goat and Ghost River; together they cover 249,548.80 acres. It carries the strictest form of government protection available in Canada: all development is forbidden, travel is on foot only, and hunting and fishing are not allowed. Its name, like that of Siffleur Mountain and Siffleur River, was chosen by James Hector in 1858 for the shrill whistles of the marmots living there.

James Hector named the area, along with Siffleur Mountain and Siffleur River, in 1858 after the shrill whistles of the hoary marmots living there. The name is a French word meaning "whistler." Visitors who hear the marmots' alarm calls in the alpine meadows are hearing the source of the name.

Access is only on foot via the Siffleur Falls trailhead on Highway 11 west of Nordegg, as no vehicles are permitted inside the area. Visitors should prepare for mountain weather conditions and plan longer trips to explore the interior.

The name Siffleur was chosen by James Hector in 1858 for the shrill whistles of the hoary marmots living in the area, and the same name was given to Siffleur Mountain and the Siffleur River. The French Wikipedia also notes that the wilderness holds one of Canada's four wild horse populations, estimated at about 100 animals and protected from capture or hunting while inside the area.